使用java邮件api发送邮件时使用MailConnectException

Question

试图使用java邮件api发送电子邮件。我一直在找MailConnectException。我尝试过多种方法来解决这个问题，但没有成功。

异常由此语句引发。

transport.connect("smtp.gmail.com", "someone@gmail.com", "myPassword");

有人能告诉我我做错了什么吗？

public static void main(String[] args) {
    String host = "smtp.gmail.com";
    String from = "someone@gmail.com";
    Properties props = System.getProperties();
    props.put("mail.smtp.host", host);
    props.put("mail.smtp.user", from);
    props.put("mail.smtp.password", "myPassword");
    props.put("mail.smtp.port", "465"); 
    props.put("mail.smtp.auth", "true");
    try{
        Session session = Session.getDefaultInstance(props, null);
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.addRecipients(Message.RecipientType.TO, "someone@hotmail.com");
        message.setSubject("sending in a group");
        message.setText("Welcome to JavaMail");
        Transport transport = session.getTransport("smtp");
        transport.connect("smtp.gmail.com", "someone@gmail.com", "myPassword");//CAUSES EXCEPTION
        transport.sendMessage(message, message.getAllRecipients());
    }catch(MessagingException e){
        e.printStackTrace();
    }
}

堆栈跟踪：

com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1;
  nested exception is:
    java.net.ConnectException: Connection timed out: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1984)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:656)
    at javax.mail.Service.connect(Service.java:345)
    at javax.mail.Service.connect(Service.java:226)
    at com.karmacrafts.util.CustomEmail.main(CustomEmail.java:127)
Caused by: java.net.ConnectException: Connection timed out: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(Unknown Source)
    at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:301)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:229)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1950)
    ... 4 more

Answer 1

这看起来像网络问题。即使这可能是由于各种原因而发生的，例如：

“无法连接到主机，端口”可能是由于主机名称错误、端口错误、防火墙阻塞(服务器、网关、甚至您自己的计算机上)、网络故障__、服务器停机等原因造成的。

你能用telnet连接到邮件服务器吗？

还可以看到这个常见问题，您犯了一些http://www.oracle.com/technetwork/java/javamail/faq/index.html#commonmistakes错误

阅读这个关于如何使用gmail https://stackoverflow.com/a/47452/3107043发送电子邮件的答案

Answer 2

Session session = Session.getInstance(props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication(username, password);
}
});   
props.put("mail.smtp.port", "587");  transport.send(message);

Answer 3

在经历了8个小时的痛苦之后，我关掉了它，解决了这个问题：

1)我的windows防火墙

2)我的防病毒软件

希望这能帮上忙